<template>
  <div id="app">
      <router-view></router-view>
  </div>
</template>

<script>

export default {
    name: 'App',
    created () {
        //在页面加载时读取sessionStorage里的状态信息
        if (sessionStorage.getItem("store") ) {
            this.$store.replaceState(Object.assign({}, this.$store.state,JSON.parse(sessionStorage.getItem("store"))))
        }

        //在页面刷新时将vuex里的信息保存到sessionStorage里
        window.addEventListener("beforeunload",()=>{
            sessionStorage.setItem("store",JSON.stringify(this.$store.state))
        })
    }
}
</script>

<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>
